Pt/α-MnO2 nanotube: a highly active electrocatalyst for Li-O2 battery
2014 (English)In: Nano Energy, ISSN 2211-2855, Vol. 10, 19-27 p.Article in journal (Refereed) Published
The preparation of α-MnO2 nanotubes (M-NT) decorated with platinum nanoparticles (Pt/M-NT) by a simple reduction and mechanical stirring method is presented in this work, which aims to design a highly active catalyst for the Li-O2 battery. The obtained samples were characterized by XRD, SEM, TEM, BET, and XPS techniques. The electrocatalytic performance of the prepared samples was evaluated by tracking the decomposition of Li2O2 during the charging process in a Li-O2 cell using in situ XRD and operando SR-PXD, which gave direct and time resolved information during the whole process. The results indicated that Pt nanoparticles were uniformly dispersed on the surface of M-NT. Even a small amount (1 wt%) of Pt on M-NT did largely enhance the kinetics of the charging process. A cell with 5 wt% Pt/M-NT showed the highest catalytic activity and lowest charging potential. The decomposition of Li2O2 during the charging process in a Li-O2 cell with 5 wt% Pt/M-NT followed a zero-order reaction. This promoting effect from the supported nanocatalyst can be attributed to the high surface area, highly dispersed and uniform Pt deposition, and proper surface state modifications.
Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 10, 19-27 p.
Pt nanoparticle, MnO2 nanotube, Li-O2 battery, charging process, electrocatalysis, operando synchrotron-based XRD
Research subject Chemistry with specialization in Materials Chemistry
IdentifiersURN: urn:nbn:se:uu:diva-234462DOI: 10.1016/j.nanoen.2014.08.022ISI: 000345986500003OAI: oai:DiVA.org:uu-234462DiVA: diva2:756721
FunderSwedish Research CouncilSwedish Energy Agency